What drinks were popular in the USSR? Whcih flavours did people choose? Let us remember.
Drinks sold in the streets had been the same for dozens of years. There were two types of them - manual and automatic ones. The parity between them was achieved in the middle of the 70s and each type had its pros and cons.
A glass of soda had the same price whether it was taken from a machine or a seller, but a glass of soda with syrup bought from a seller was 1 kopeck more expensive. Even at a higher price one could buy a very tasty double syrup drink. And sellers could always give the odd money back.
Soda machines had their own advantage - the dodgy ones could deceive a machine by giving it a forge instead of a coin. Besides being struck a machine could give someone's coins back which was a big luck.
But it didn't mean that machines always lost, sometimes they could swallow money and gave not a single drop of soda back. Moreover sometimes machines ran out of syrup and they basely added "pure" water instead.
Besides glasses of those machines were often stolen by boozers.